【题文】若,且,则( )A.0B.C.1D.2
【题文】若,且,则( )A.0B.C.1D.2
题型:难度:来源:
答案
【答案】D
解析
【解析】
试题分析:∵
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162737-37176.png)
,
∴
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162738-39063.png)
,
∴
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162738-88502.png)
,
∴
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162739-43159.png)
,
∴
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162739-56598.png)
,
∴
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162739-71002.png)
.
考点:对数的运算.
举一反三
【题文】已知
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162456-79815.png)
,则( )
【题文】已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162414-45897.png)
在区间
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162415-61653.png)
上的最大值与最小值的和为
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162415-83244.png)
,则实数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162415-85189.png)
___
___.
【题文】已知函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162253-48041.png)
在区间
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162253-71648.png)
上的最大值与最小值的和为
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162253-38325.png)
,则实数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162253-13460.png)
___
___.
【题文】函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330162046-97545.png)
的定义域是
.
【题文】函数
![](http://img.shitiku.com.cn/uploads/allimg/20200330/20200330161835-61824.png)
的定义域是
.
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